Battery casing



FIG. 1 is a perspective view of a battery casing showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a second side view thereof;

FIG. 5 is a first end view thereof;

FIG. 6 is a second end view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a battery casing, as shown and described. 